Gear oil MOTUL or AMSOIL

I have the 5sp manual and use Motul 300 75w90 gear oil for the trans & dif.

The best gear oil you can buy is Motul Gear 300 but I’m not sure that will help you here.

Brakes are genuinely impressive for this segment. Only real issue I faced was chain wear — once you start maintaining it, it improves. I lube mine with 2T gear oil, works surprisingly well. Used Motul for most services, but the last one was with Prolube and the bike feels a bit rougher since then.

If Wavetrac and my gear manufacturers like Motul 300 75W-90, I'm content with it.

When I was researching MTF I found several experience that said the older Toyota transmissions get a little crunchy on the RedLine and I saw lots of good reports for Motul 300 75W-90 so I used that in mine earlier this year. It doesn't have issues but the shifting is ever so slightly smoother.

Fresh gear oil can help grinding synchros. It sounds weird, but it's true. 75w90 GL5 is the oil you need. Motul gear 300 is the most recommended gear oil brand for subarus, but any GL5 rated 75w90 gear oil will probably help a lot.

TBH, I recommend OEM fluid for the trans for this reason. It's too much of a minefield with hybrid fluids. I used to recommend Amsoil (I use it) but they no longer have the gear oil I use.

Amsoil makes a 75w-85 severe gear lube but I've always used the same in 75w-90 with no issues.

I just did my differential and tranny oil change a few months ago, did Motul Gear 300 75W90 in both.

Amsoil severe gear lasted until ~3200 km, but it started again, but much slower progression.